This card cannot be destroyed by effects. If this card has "Blue Storm Dragon, Maelstrom" as Xyz Material(s), it gains 200 ATK and cannot be targeted by your opponent's card effects. This card's Attribute is also DARK. Once per turn, during your Main Phase 1, if you have 4000 LP or less, you can detach 1 Xyz Material from this card: During this turn, if this card attacks, it gains 500 ATK during the Damage Step only, negate the effect of battled monster, and your opponent cannot activate any card effects until the end of the Damage Step.